32.99% is the change from 391 to 520
Calculation steps:
[( 520 - 391 ) ÷ 391] x 100 = 32.99%
Formula
Percentage change = [(520 - 391) / 391] x 100
Subtract the new number by the original number
520 - 391 = 129
129 ÷ 391 = 0.329923273657289
0.329923273657289 x 100 = 32.99%